This is a dose finding study using a 3 + 3 dose escalation and expansion design to determine a Not Tolerated Dose (NTD), Optimal Biological Effect Dose (OBE) and / or Maximum Tolerated Dose (MTD). These data will be used to establish a Recommended Phase 2 Dose (RP2D) for the combination of CC-292 and Rituximab in subjects with CLL.